Casing-head.



No. 878,067. PATENTED FEB. 4, 1908.

D. K. JOHNSTON..

CASING HEAD.

APPLICATION FILED NOV. 29. 1907.

91% n eon:

bein firmly pressed against the tubing couption of pumping the well, and, with casing vertical central section of a casing head em- 40 UNITED STATES PATENT OFFICE.

DAVID K. JOHNSTON, OF OIL CITY, PENNSYLVANIA, ASSIGNOR TO OIL WELL SUPPLY COMPANY, OF PITTSBU RG, PENNSYLVANIA, A (.ORPORATION OF PENNSYLVANIA CASING-HEAD,

Specification of Letters Patent.

Patented Feb. 4, 1908.

Application filed November 29. 1907. Serial No. 404.372.

T 0 all whom it may concern:

Be it known that I, DAVID K. JoHNsToN, a citizen of the United States, residing at Oil City, in the county of Venango andState of Pennsylvania, have invented certain new and useful Improvements in Casing-Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the construction of easing heads for oil wells, and is particularly designed to prevent leakage of gas around the top of the casing head and to support the tubing in such manner that it is not apt to be broken at a point which would let such tubing drop into the well. 4

As is well known, the tubing is frequently broken by the blowing down of the derrick and also by the vibration due to the operaheads now in common use, the result of such break is usually that the tubing drops into' the hole and the producer'is put to much labor and annoyance in an attempt to recover it. To overcome these difii'culties I construct a casing head in which the coupling that connects the tubing rests upon a casing head ring that is supported upon an annular seat formed within the casing head, a pack-- ing ring, which prevents the leakage of gas and the vibration of the tubing in the well,

y means of a stufling box gland. n the drawings chosen for the purpose of illustrating my invention, the scope whereof is pointed out in the claims, Figure 1 is a lin bodying my invention, and Fig. 2 is a plan view thereof.

Like symbols refer to like they occur.

I will now proceed to describe my invention more fully, so that others skilled in the art to which it appertains may apply the same.

In the drawings, A is the casing head, B the casing head ring, 0 the packing ring, I) the gland or stuffing-box follower, E, E the bolts by which the gland D is forced against the packing ring 0, F, F the sections of tub- I ing adjacent to the casing head, and G the partsfiwlierever of the usual or any other suitable form.

coupling by which the sections of tubing F,

Fareconnected.

Intermediate of its ends, the casing head A is provided with-one or more gas outlets 1.

lower end of the casing'head is intcriorly threaded, as at 2, to afford a means of connection with the threaded end of the well casing, while the upper end of said casing head is formed with a vertically extending" extension 3 constituting a shilling-box. Thelowcr end of the stulling-box chamber is contracted to form an annular shoulder, as 4, which affords a seat or supportfor the casing-head ring B.

The casing-head ring B, which is appropriately formed to have a firm bearing on the seat or support 4, has a central opening which is somewhat smaller than the tubing coupling G, but which is sullicicntly large to permit the passage of the tubing 1'. The upperface of the ring B is preferably concd or dished, as M1", to assist in forcing the packing ring C tightly against the sleeve coupling -G, such conical form, moreover, being advantageous in centering the tubing F, the lower sections of which, it will be observed, are supported by the casing-head A through the intermediacy of the casing-head ring B and tubing coupling G.

Interposed between the easing-head ring B and the gland D is a rubber or other suitable acking ring C the upper and lower faces of which are preferably coned or beveled to correspond to the proximate faces of the said casing head ring and gland. The packing ring O is formed with a central aperture whlchis large enough to permit it to be sli 'ed'upon the tubing 'cou ling G. v e stuffing-box gland B, which is provided with perforated lugs 1 for the recep tion of the follower bolts E, E that pass through the lugs 5 formed u on the body of the casing-head, is su'l licient y lar e to em brace the coupling G and is prefera ly coned or beveled at its lower end 2 in order to most effectively cooperate with the casinghead ring B in forcing the packing C against the coupling G. i

The casing-head heretofore described is particularly advantageous in use as it permits the stulling box gland to be slipped over the last joint of tubing after such tubing has The 'mg coup ing, thus been placed in the weu, while in stuifing-box casing-heads now employed such gland must be placed upon the last joint of tubing prior to lowerin said tub' into the well. It will be noted t at by placing the packing ring C around the coupling G, instead of directly around the tub' ported that any reak in the tubing, due to vibration or the blowing over of the derrick, is most a t to occur at a point above the tubreventing such tubing from dropping into t e well.

In addition to its use as a device for supporting the tubing of a well, my casing-head may be employed as an oil saver, when drilling in oil sand while the well is flowing. For such purpose the usual short cylindrical tube or oil saver barrel, which is of a diameter that will pass thro h the casing-head ring B and gland D, is su stituted for the tubing F, F and coup G. The drilling cable is passed through the tube and packed by ro e yarn in the customary manner. The tu e thus works up and down with the drilling cable through the closely fitting packing ring C, and t e oil is led ofl and saved through the outlets 1 in the sides of the casing-head.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

v 1. In a casing-head, the combination with means for supporting a well tube coupling,

, the said coupling is so supof a packing ring adapted to be pressed laterally against the coupling, and means for pressing said packing ring against said coupling.

2. A casingihead having one or more gas outlets, a stu ng-box extension formed with a seat for supporting a casing-head ring, a casing-head rin which is adapted to support awell tube cou ing, astuffing-box gland, and.

a packing ring ocated Within the stufling-boX and adapted to be pressed against the coup-:

ling by said gland and casing-head ring.

3. A casing-head'having one or more as outlets, a stuffing-box extension provided upon its interior with an annular seat for'supportin a casing-head ring, a casing-head ring W ich is adapted to cnga e and support a well tube coupling, a stu in -boX gland DAVID K. JOHNSTON.

Witnesses GEO. N. REED, E. R. GNADE. 

